.bill{
    width: 1000px;
    height: 600px;
}

.head{
    width: 100%;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.head>div{
    margin-left: 20px;
}

.center{
    width: 100%;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding-left: 20px;
}

.bottom{
    margin-top: 10px;
    width: 100%;
    height: 450px;
    overflow: scroll;
    overflow-x: hidden;
}

.marginRight{
    margin-right: 20px !important;
}